Trimming mechanism for sewing-machines.



1. R. MOFFATT. TRIMMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 11, I907- 1,185,709.. Patented Apr. 13, 1915.

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' J. R MOFFATT.

TRIMMINGMECHANISM FOR SEWING MACHINES; APPLICATION FILED MAR. 11. 1901.

1,135,709., Patented Apr. 13, 1915.

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THE NORRIS PETERS 60.. PHOTO-L!THO.. WASHINGTON. Dv Cv iuvirun srra'rns ra QFBEQE,

animus R. ivr'orrnri, or 'ciiicneo, nt noisyassisno'n in inircn smear, iVIA'CI-IINE COMPANY, 0F cHIc-Aeo ILLINOIS, A summaries: OF'I-LLINOIS.

TRIMMING MncI-iAnIsM roe sswme-nncnmns.

Specification of Letters EP'atent.

Patented Apr. 13, 1915.

Ajitl'ibatiijiifildi/[ih 11, 196?. "seriai 1%. 31:13:27.

Taallwlhom it may concern; 7 r

Be it knownthat L'JAMns R MOFFATT, a citizen of the United Statearesiding at Chica'go, in thecounty'of Cook, State of Illinois, have invented certain new anduseful 11npro'vements in Trimming Mechanisms for Sewing-Machines, of which the following is a description, reference being had to the a ccompanyingdrawing and to the letters and gures of' reference marked thereon.

My invention relates to new and useful improvements in trimming mechanisms, and has object to. improve the structure of the' trimming members and also the manner of upporting the same. "While I have shown my improved trimmechanism as applied to a sewing machine, it will be obvious that said trimming mechanism may be used in any relation where it is desired to trim or cut a layer or layers of fabric, and to deflect one of the cut edges fromthe other. Ihave also shown my trimming mechanism as operating to sever only oueof two superposed layers of fabric by lifting the upper layer and supporting the same, whilethe other layer is being cut, but it will he obvious' that my trimming mechanism may be use to sever all of the layers of fabric passing through the machine. v

My invention consists in "a trimming member; having an overhanging cutting blade and a tapered shank for supporting said overhanging cutting blade, said tapered shank operating to deflect one of the cut edgefs'from the other cut edge.

My invention further consists in means fer supporting the lower trimming member, so'lthat the same may be held rigidly "when under the strain pf the cutting action of the ether uttinginmber.

My invention further consists in the novel partsfimproverhents arid arr ngeme ts hereiiiafter shownand described, and set forth inth'e claims. I H p v U Inithe' drawings, which new one embodihaving my trinnnin neetanism applied thereto Fig. 1 3 is a perspective view 01f my upper" trimming member; g. 4 is a heat same; 6 is a plan view, showing the relatidn' of the trimming member to the needles of a sewing machine, and the manner in which one of the cut edges is d'efl'ectedbetween said needles,the upper layer of fabric being broken away to more clearly show this relation of partsandth'e trimming member being sectioned; Fig. Tisa perspective'view showing the relation; of the trimming memher with its tapered shank, to a layer of fabric which is being out]; Fig, Sis a sectional View, showing the manner "of supporting my lower'trimmin -member. H I v The trimmer-operating mechanism shown in Fig. 1 of the drawing is similar to that shown application Serial No. 353,277, filed January 21st, 1907, and consists generally speaking, of a work support 1; presser foot 2; needles 3, 3; a throat plate 4; a inain'shaft 5, which carries at its forward end a double crank 6, one of which operates the feed bar 7 carrying the feed dog 8, and the other of which operates upon a lever 9 through a link 10. Said lever 9 is fulcrurned upon a controlling bar 11, which is held by means of a spring 12 in contact with a stop nut 13, 1 By meansof a link 14:, said controlling bar-'11 may be turned about its pivotal support 15, until the same is brought into contact with the stop nut 16. Saidlever 9 is connected by means of a link 17 with arock arm l8, secured to a shaft 19 you which the trimmer bar-2'0 is supported; Said trimmer bar carries at its outer end the upper trimming member 21. Said trimming member 21 extends up throligh thelthroat plate, and has an overhanginglblad e22, which coeper'ates with the stationary blade. 2 3 se'cur'ed to the throat plat saiduimming members, as shown in Fig.2, are located so that'the line on which the fabric or material is severed, passes practically'through the left hand needleg'or il'fi idle. puncture. This upper trimming member has a forwardlv projecting tapered bl'adevwith a penetrating point 24:, and ashank 25 which tapers substantially frointhe planebfthe cuttin'g ed'ge of the cutting blade to the rear side of said shank, asplearlyshbwnjin Figs. 3, 4 and 5. The purpose oiulis taper d portion 26, is to defleet one fo'fthe cut edges,

As shown in Fig. 6, the trimming mech- 'an'ismjwhen operating in connection with stitching mechanism, is located in front of the same, and the planeof thecutting edges I of the trimming blades,- passes substantially throughfor justto the left of one of sa d needles. One offthe cut edges of the'fabric will, therefore, pass, along the outside of said needles, solthattheicross stitching 'mechani sm' willnotengagethe same. The otherj'cutledge is by means of the tapered shankof'the cutter, 'deflectedcentrally betweenlsaid needles, so that'the cut edge is placedwell back fromlthe needle in order thatfthefistitches-may jlie well over said vcut 7 edge, and. preventthe cut loops .of fabric from showing through thecovering threads of the overedg'ing stitches.

' In the preferred formof jniyinvention,

j "the penetrating ;pointf2 l. of the upper trim "ming member servesto separate the two superposedlayers, so that'theunderlayer only isltrim'med, and one ofthe cut edgesIis de,-. .fiected by the taperedfshank portion of the cutting member between the'needles of the stitching mechanism, and. said edge is stitched {d own; to :the upper. layer. .offabric.

The lower trimming 'frnember issupported l on the throat plate a depending lug 27,. whichlis recessed sofas toform a, seatfor the lower end of said trim sm' Said tri 1 nmingf1nember'is held in its seat by means of ascrew '28, shown in dotted lines -'in Fig. 8. The throat plate d, is also pro vid'edwith aseat, or recess29, in whichthe The; operation of the uppertrimming member 'is'such thatsconsiderable' strain' is ,Y d,i therefore,lhave foundit quite essential to provide means for, rigidly and 'firmly "supporting the -said'lower trimming member and holdingflthe;same"against lateral-move- I i V 1 placed iup'onl the lower trimmingmember,

While I haize as; thetrimming meeh- 'ani'sjm;s :la ted re t v h h g f mechanisnithat the"tapered portion of the f shank of theicuttingbladewoperatesito deo 'd les, i tisgquiteobvioutht rsaidltrimming' mechanism mayjjebe shiftedrelativ'togthe stitching mechanism,1soi that the deflected flect oneof the {out edges betweensaid-neeedge may.beIcarr ed -outside r both jneedles andtheinon-rdeflectededge arrangedito pass ""betWQeIi t-he memes, It ,will further. be eb- 'viousthat althougH-Ihave shown my gtrimfining "mechanism. operatingfiin connection. with stitch-forming iinechanism, that} theg p trimming blade with thef deflecting-l tapered V shank may befused in anyrelation where it r is desired'to deflect one ofthe twoout edges. 7 v, 'lh'e' 'operation 'ofmy device will be .obvi jous-f f m the aboye description}; Theimovacross-'the plane of the fabric through the :link 17, the lever 9 and the double crank 'member 6, carried by the main shaft.

feed bdog operates when the trimmer is raised, to move'thefabric forward, and as the fabric whichhas been severed is moved forward, the tapered shank of the trimming member deflects one of the cutedges away from the other, and, as shown in Fig. 6, said cut -edge is deflected between spaced needles 3, 3. If, however, the trimming blades beadjusted relativ'eto the stitching mechanism to the right, assho'wn inFig. 6, the-tapered shanki wouldthen deflect the cut edge outside ofthe right hand needle, while the other edge of the fabric would pass between said needles. V The main purpose of the taptered shank isto open'upthe cut edges so as to make a clearpa'ssage for one of the needles, while overstitching one of the cut edges. v i V. o

@By providing the throat plate with a seat 29 for the forward free end of the lower stationary trimming blade, and by extending the ledge 30, which forms one wall of said seat, so that the same overlaps the end of the blade, as clearlylshown in Fig. 2, I have provided means which-will not only take the downward thrust upon the stationary cutting blade, but which will also -i prevent said cutting. blade from being moved laterally, and the material drawn between the cutting blades rather thansevered.

V It willbe obvious that minor changes in thedetails of the construction-herein shown may. be made, @withoutgdeparting from the spirit of my invention.

.Having'thus described my'invention, what Iclaiml as new and desire to secure by Letters Patent,"is: a

61;. A sewing machine comprising incombination stitch-forming mechanism, includring. two spaced needles and a trimming mechanism' including a trimmer blade arranged in advance of said needles, said trimming blade having :itscutting edge at one face thereofand lying in a line passing outlsidebf said needles-whereby one of the cut fedgeswill be directed outside of-said needles andmeans for directing the other out edge betweensaid needles; f;

I :2. A? sewing machine includingin com- ''bination, -'stitchforming" mechanism comprising; spaced needles and a trimming mechanism, includinga trimming member 7 arranged infront of said needles and having a tapered shank 'fonde'fiectin one of the cut 'edges :between' the sai spaced needles; substantially as described. V Asewing machinejnduding in comibin'ation, stitcheforming- *mechanism, comprising spaced needles and a' trimming H I v mechanism including an overhangingtrimb 1.t em mbe 2 -1. a e min ede'aitepered shank forfiupp rtin The r the same, one face of said shank lying in a vertical plane extending outside of said needles, and the other face of said tapered shank lying in a vertical plane passing be tween said needles; substantially as described. I

42. A. sewing machine including in combination, stitch-forming mechanism comprising spaced needles and a. trimming mechanism arranged in front of said needles, comprising upp'er and lower trimming members said upper trimming memher having a pointed overhanging cutting blade, and a tapered shank for supporting said cutting blade, said tapered shank having one face thereof lying in the plane of the cutting edge, and the other face thereof extending at an angle thereto, whereby one of the cut edges is deflected between said spaced needles; substantially as described. 5. A sewing machine including in combination, stitch-forming mechanism comprising spaced needles and a trimming mechanism, including a lower stationary member, and an upper movable cutting member, said upper movable cutting member having a pointed forward end and an overhanging cutting edge, anda shank for supporting the same having a tapered face, whereby one of the cut edges is deflected I from the other out edge, said trimming mechanism being so located relative to said needles that one of said needles operates in the space between the separated out edges; substantially as described.

6. A. sewing machine including in combination, spaced needles, a feed dog, a trimming mechanism including a trimming memher, a tapered shank for supporting said trimming member and lving in the path of movement of said fabric and in front of said needle, said tapered shank serving to deflect one of the cut edges from the other as the feed dog moves the material forward,the plane of the tapered portion extending between said needles, whereby one of the cut edges is deflected between said blade and a tapered shank, the tapered portion of said shank serving to deflect one of the cut edges between said needles, as the feed dog moves the material forward; substantially as described.

8. A sewing machine including in combination a stitch forming mechanism including spaced needles, a trimming mechanism in advance of said spaced needles and including a cutting device, means for separating layers of fabric to be stitched, whereby certain layers only may be out, said cutting device having an overhanging cutting edge and a supporting shank, said supporting shank including means for separating the cut edges, one of said needles being behind the shank of the cutting device in the line of feed, whereby one of the cut edges is directed between the needles while the other out edge is directed at one side of both needles.

9. ln a trimming mechanism for sewing machines, a throat plate, a depending lug carried thereby, and a ledger blade supported by said lug and having its longitudinal axis inclined to the plane of the throat plate and having its upper end substantially flush with the upper surface of said throat plate, said plate having a seat for receiving the upper end of said ledger blade to prevent downward and lateral movements thereof.

In testimony whereof I aflix my signature, in presence of two witnesses.

JAMES R. MOFFATT.

Witnesses:

C. MoNnIL, A. B. CLoTHInR.

Copies ofthis patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, D. G. 

